Autogenous cutting apparatus



Patented Apr. 21, 1931y -UNrrED STATES PATENTOFFICE- HANS GREG-GERSEN,QF HAMBURG, GERMANY AUTQGENOUS CUTTING APBALRIATS Application led April30, 1929, Serial No. 359,275, and in Germany .Tune 5, 1828.

This invention relates to an apparatus the 'the which the succession oftheir operation isA automatically determined.

A further obj ect is the provision of means whereby the ratio ofmovement'oi the burners with respect to the manual control may bereadily set and maintained throughout the operation.

The invention is illustrated in the accompanying drawings, in which: f

Figure l is a view in side elevation of the improved apparatus.

Figure 2 is a plan of the same.

Figure 3 is a transverse section through the base plate. Y p

Figure l is a planrof a pedal, showing the, means for controlling theproportion of movement of the burners with respect to the manuallyoperable element.

rlhe apparatus includes a base plate a' of hollow form, the bearing edgeof which is providedwith a sealing gasket il, preterably a rubber ring.A. diaphragm c'grv'having a diameter substantially corresponding totheinterior of the base issecured at its peripheral edge to the innerside of 'the top ot the base and is connected at its central portion toa bar a. having teeth to cooperate with a pinion n supportedupon a shaftnl extending transversely of the base and operable by ahandle t. Bysuitable operation of the handle, the diaphragm may be moved within thebase to reduce or increase the area thereof open to the suction. Y y y Y.The interior of the base is open to a suction effect through a channely, and with the diaphragm depressed, as indicated in Figure 3, it willbek apparent that the base, under a substantial rarefaction of the airtherein, will be secured to any surface with which the sealing gasketV lmay properly engage. Furthermore, after rarefaction of the air withinthe base, the 'holding eirect may be materially increased by operatingthe shaft nl to raise the diaphragm Vas will be (obvious.

Supported on pa'plate carried above or beyond the base by suitablepedestals spaced valve .,chainbers, one of which are has a nippleextension In by which it may be connected to a suitable source of supplyof oxygen, andthe other of which has a nipple 9 through which the valvecasing may be connected to a suitable source of supply of gas for thepreheating jet. The

valveV chamber in communication with the oxygen nipple 7a4 is providedwith inde* pendent valves 7c, icl, k2 and 703, while valve chamber inrcommunication with the ,the

gas nipple gis provided with independent valves fir, 7 and is.

Between the valve inV any appropriate manner with the -spective valves,so that on rotation of a series of cams `Z1 adapted, in the rotation kofthe body, to actuate levers m1v connected rethe body the valves areautomatically actuated in the proper sequence for the desired results.

An injector G is in communication with mined.

The oxygen admitted by the openving of the valve 7c through the injectorpasses beyond the latter through an outlet conduit o and may serve forcooling burners it necessary. y

the

Rising from the base is a hollow pedestal in which is rotatablysupported a standard a.. On the standard is rotatably supported apantograph construction d at one apex of which is arranged a verticalpipe carrying at its lower end a nozzle Z) which is appropriately formedto provide a cutting jet. The pipe leading to this jet Z) is incommunication with the oxygen valve 7%.

Carried by the pantograph in slightlyv offset relation from the cuttingjet is a pipe terminating in a nozzle formed as a preheating jet c, andthis preheating jet is in communlcation with the oxygen valve k2 andalso in connnunication with the gas valve i7. Theroperative end of thepantograph is arranged as a bolt e designed to be operated by hand forshifting the respective jets in accordance with the operation of thebolt. The jetcarricd end of the pantograph is shifted to selectivelyposition either jet for operation through the medium of a bar w1connected to the pivot of the pantograph and movable over a sectorshapedplate m2 secured to the standard a. The end of the bar m1 remote fromthe shaft or standard a is provided with a gear g cooperating with teethon the curved edge of the sector azz so that the bar may be tempoArarily held in adjusted position. Obviously, through shifting the barthroughout its range of movement, the jets will be shifted, so that aparticular jet may occupy a redetermined position.

he bolt e is provided with a hollow extension in which is slidable agraduated rod el, one end of such rod being fastened to the bar m1. Byadjusting the bolt through the medium of this bar, it will be apparentthat the radius of moveu'ient of the jet end of the pantograph may bereadily governed, it being understood that the connection between thebar c; and the bar a" provides a center e2 about which the bolt e ismoved as a crank in controlling the movement of the jets.

The base i is provided with a bar pivotally connected thereto andterminating in a centering point f, which latter is designer to be moveddownwardly into cooperation with a punch hole f1 formed in the mate-Vrial for indicating the position of the contemplated hole.

As soon as the point of the centering apparatus f reaches into the punchmark f', the apparatus is set upon the center of the hole. By means of agear wheel y; and a gear segment w3, first the cutting burner is setupon the center of the hole or l0 mm. from the periphery, and after thecutting through the ring burner is set likewise, thereby insuring thatthe fiattened side of the gear wheel g (Figure i) must l lie against thesegment li. In the setting of Figure 4; the cutting-through burner Zistands upon the center of the hole. Upon shifting the gear wheel g intothe dot-anddash line position, the cutting burner c is set upon thecenter of the hole. .By releasing the lever c, a teniplet lying belowthe same may be traversed by the bolt c in a suitable manner, so thatthe burners b and c will correspondingly execute the same motion.

The valves c, k1, z, 7.1 and 7, 4, s may now be operated in any desiredway. It has already been noted that the valve 7u is connected with theinjector fic. The valve 7a2 must, on the other hand, serve as theadmission for the oxygen in the preheating jet c, and the valve 1, asoxygen admission valve for the cutting jet l). On the contrary, thevalve ii, has already been connected as air passing valve to theinjector i6. The valve if? must serve as gas inlet valve for thepreheating jet. Of course, other valves for specified purposes may alsobe present. Thus, for example, in the exemplary embodiment the valve sis intended for the purpose of discharging, when lifted, a gas streamover a conduit la., in the centering apparatus, from the point of' whichthe gas stream is discharged. By setting the centering apparatus againsta thin incandescent wire, this gas flame may be ignited and then be usedfor igniting the preheating flame. A suitable induction ignition mayalso be provided.

Further, an element which controls the circular cut may also be affectedby the operating shaft l; for example, a clockwork may be mechanicallyconnected into or out of service or a suitable motor may be influencedby the shaft. This automatic operation of the jets in contrast to allother machines is possible for this reason, because the entirearrangement is independent of the existing conditions at all times andremains rigid and innnovable.

lt will be noted that he diaphragm '3 after the evacuation of the spacebelow same may be lifted by the lever l1, which is fastened movably upona shaft a', whereby thix space may be still further evacuated.

The method of operation of the invention is as follows:

The radius of the hole to be burnt is set upon the scale el. Then thegear wheel (7 is oscillated, whereby the cutting burner pushed away fromthe periphery of the hole to be cut for a distance corresponding to theoscillated segment toward the center of the hole. The centeringarrangement f is folded downwardly in the position f and set into thecenter punched hole f1. Thereupon, the base plate e' is set upon thearticle to be operated on and the operating shaft Z turned to a certainextent. Thereby, the cams in the exemplary embodiment open the valve andthe valve il. Thereby the oxygen of the plate e' becomes still furtherevacuated and the entire arrangement is unfailingly held tight to thearticle being operated on.

Upon further turning of the shaft, the gas valve i7 and the oxygen valveles are opened. rllien triev preheating jet is fed. Now the shaft isturned further, the cam lifts the valve k3 and Vfeeds the piercingburner L7) with oxygen,v and the position for which it is set becomespierced. Thereafter by actuation of the gear segment g, the ring burnerZi is pivoted away and stands over the pierced position of the hole tobe out, whereupon then the cut follows to 'the periphery by pivoting andthereupon the circular cut by turning the crank e.

Vhen the hole is cut out, the shaft is again turned further, whereuponalso the last valves become closed and thereby both burners b and cbecome free from oxygen and gas.

Upon a final rotation of the operating shaft, the valve i is againlifted and thereby the interior of the plate is put in communicationwith the outer air. Accordingly the device again becomes free from thearticle being operated on and may be set by Vmeans of the centeringdevice f into the center punch hole of the next hole to be cut. Sincethe burners have now become warm through the previously cut hole, theoxygen used for the evacuation of the base plate may be connectedthrough a conduit o which terminates in theV vicinity of the burner andmay cool the same advantageously during the setting time of theapparatus against the article being operated on.

The entire apparatus is provided with one or more handles which may bearranged as desired for convenient handling.

The mode of operation of the valves is briefly as follows. After the airhas been sucked out of the suction plate z' and the evacuation valveagain closed, the piercing burner receives gas and oxygen for preheatingand thereupon oxygen for piercing, while the two first valves close.After the shifting the ring burner receives heating gas and heatingoxygen and thereupon simultaneously cutting oxygen. After thecompletionof the cut, all the valves are closed, only the evacuation valve isagain opened and the plate freed. The piercing burner is provided withonly one jet and discharges, on the one hand, ak gas-poormixture forrapid preheating, and on the other hand, directly the oxygen forthepiercing.

lVhat is'vclaimed tobe new is:

l; Anl apparatus ofthe class described comprising Va base, a centeringimplement for cooperating with the work to determine the position of thebase, burners, valves for controlling the supply ofgas to the burners,and means to insure theflo'w of gas acting as a suction medium on :theinterior of the base to hold the base fixed with respect to thesurfaceon which it is operating.

2. An apparatus of 'the class described, comprising a hollow base,'asealing edge therefor, burners, valves for controlling the adi-nissionof gas to the burners, manuallyV operable means for successivelyoperating the valves, vand a valve for controlling the passage of gasfor exhausting the air from the interior of the base. A

3. An apparatus of the class described, comprising a hollow base, asealing edge therefor, burners, valves for controlling the admission ofgas to the burners, manually operable means for successively operatingthe valves, valve'for controlling the passage of gas for exhausting theair from-the interior-ofthe base, and manually operable means within thebase for increasing the interior Varea of the base following the suctioneffect, whereby to increase the holding power of the base. f Y f li..Anapparatus ofthe class described including a hollow base having asealing edge, burner jets carried by and movable with res pect to thebase, valves on saidbase for controlling the feeding of gas to the jets,an injector having communication with the interior of thebase, anadditional valve on the base, and a connection between said additionalvalve and the injector to utilize the passage of gas through said valveas a means of exhausting the interior of the base.

5. :Anapparatus of the class described including a hollow base Ahaving asealing edge, burner jets carried by and movable with respect to thebase, valves on said base for controlling the feeding of gas to thejets, an injee-tor having communication with the interior of theY base,an additional valve on the base, a connection between said additionalvalve and the injector to utilize the passage'k of gas through saidvalve as a means of exhausting the' interior of the base, a diaphragmarranged within the hollow base,

and means for manually operating theV diaph'ragni to increase the areawithin the base open tothe suction eifect,-

In an apparatus ofthe class described, a base, burner jets movable withrespect to f he base, valves for controlling the passage of gas to saidjets, said `valves being arranged in spaced parallel series, and amanually operable element arranged intermediate the valves and adaptedin operation to successively control the valves.

7. In an apparatus of the class described, 5 a base, burner jets movablewith respect to the base, valves for controlling the passage of gas tosaid jets, said valves being arranged in spaced parallel series, amanually operable element arranged between the valves, cams on saidelement, and means whereby each cam is adapted in a predeterminedposition of the element to control one of the valves.

8. An apparatus of the class described comprising a preheating burner, acutting burner, a pantograph support for both burners, a pivot aboutwhich the pantograph support is movable, a support for the pivot, a arconnected to the pivot of the pantograph, a sector-shaped plateconnected to the support and over which the bar is movable, and meanscarried by the bar and cooperating with the plate to provide for holdingthe bar in adjusted position with respect to the plate against casualdisplacement.

9. An apparatus of the class described including a preheating burner, acutting burner, a pantograph support for both burners, a pivot aboutwhich the pantograph support is movable, a support for the pivot, a barconnected to the pivot for the pantograph, a sector-shaped plateconnected to the support and over which the bar is movable, and a gearcarried by the bar to cooperate With teeth formed on the curved edge ofthe sector plate to thereby hold the bar against casual displacement inany adjusted position relative to the plate.

10. An apparatus of the class described including a preheating burner, acutting burner, a pantograph support for both burners, a pivot aboutwhich the pantograph support is movable, a support for the pivot, a barconnected to the pivot for the pantograph, a sector-shaped plateconnected to the support and over which the bar is movable, a gearcarried by the bar to cooperate with teeth formed on the curved edge ofthe sector plate to thereby hold the bar against casual displacement inany adjusted position relative to the plate, a bolt carried by thepantograph for operation thereof, a graduated rod slidably connected tosaid bolt, and a connection between one end of said rod and said bar,said connection providing a center about which the bolt moves as a crankin governing the movement of the burners.

In testimony whereof I affix my signature.

HANS GREGGERSEN. [ns1

